build: fix empty function execution

- If the function is empty *or* unset, don't exec it.
- If the function is unset, warn.

Signed-off-by: Chris Larson <chris_larson@mentor.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/bb/build.py b/lib/bb/build.py
index 03b0b1713..4c4946de0 100644
--- a/lib/bb/build.py
+++ b/lib/bb/build.py
@@ -129,8 +129,9 @@ def exec_func(func, d, dirs = None, logfile = NULL):
     """Execute an BB 'function'"""
 
     body = data.getVar(func, d)
-    if body is None:
-        logger.warn("Function %s doesn't exist", func)
+    if not body:
+        if body is None:
+            logger.warn("Function %s doesn't exist", func)
         return
 
     flags = data.getVarFlags(func, d)